We send a signal to application A, to check if there is data ready for us to send to application b.
We do this every 5 min and is an automatic process
This applies to all flows, we reach a maximum of 10 products, orders, stock on products, etc.
So if you have 1000 products it will take about 8 hours for all your products to be updated with the relevant stock. If 10 orders are placed in application B 4 minutes, it will take 10 minutes for it to be visible in application A
This applies for every flow.